'ello and once again thank you for your suggestion! Unfortunately, this suggestion has been declined, as this is not something that we will be considering doing in the future. The Sword of Griffin exists as an old staff collectable and is not something we would like to give out. In terms of giving the Sword to a Griffin, we already have a Head of House. Additionally, any player or staff member is welcome to help Griffins in need, and we encourage players to help others. This would also leave the other houses without the same kind of feature. There are also several more wonderful points in above posts in this thread, but additionally, you don't need an item in order to show how much you care about your house.
We hope to hear more suggestions from you in the future though!